摘要
随着新能源占比的提升,系统惯性降低、调频资源减少,系统频率稳定问题严峻。因此在新型电力系统运行方式多变的背景下,如何快速精准评估大功率扰动下系统频率安全指标显得尤为重要。其中频率最低值指标由于与多种参数存在高度非线性且无法显式表达的量化关系而难以实现快速准确预测,是频率稳定安全指标评估的研究重点。然而,目前频率最低值快速预测方法难以考虑调频备用的影响。为此,基于系统频差曲线抛物线近似的假设,对平均系统频率(average system frequency,ASF)模型进行开环解耦,进一步得出系统频率最低值时间与调速器输出功率之间的量化关系,最终实现考虑调频备用容量的频率最低值快速预测方法。该方法在小系统和ACTIVSg2000算例上的预测精度分别为99.28%和97.71%,算例结果证明了算法的有效性。该方法对频率安全约束下机组组合、频率稳定控制措施的有效性评估以及频率稳定约束下系统新能源运行承载能力评估等问题具有重要意义。
With the increasing proportion of renewable energy in the power system,system inertia decreases,and frequency control resources become scarcer,posing a severe challenge to system frequency stability.Therefore,in this context of ever-changing operation scenarios,it is particularly important to rapidly and accurately assess the power system frequency security indices when there are large power disturbances.Specifically,the frequency nadir,which has a highly nonlinear and unexpressed quantitative relationship with multiple parameters,making it difficult to predict accurately and quickly,is a research focus in the power system frequency security assessment.However,current methods for rapidly predicting the frequency nadir do not adequately consider the impact of frequency regulation reserves.This paper,based on a parabolic approximation of system frequency deviation for the average system frequency(ASF)model,presents an open-loop decoupling approach.This approach allows for the quantification of the relationship between the system frequency nadir and governor output power while accounting for frequency regulation reserves.Ultimately,it facilitates the rapid prediction and evaluation of the frequency nadir,considering the impact of frequency regulation reserves.The accuracy of this method is validated through case studies on a small system and the ACTIVSg2000 system,with prediction accuracies of 99.28%and 97.71%,respectively.This method is important for addressing issues related to unit commitments with frequency safety constraints,evaluating the effectiveness of frequency stability control measures,and assessing the operational capacity of new energy sources within systems subject to such constraints.
作者
莫维科
严焕斌
赵天阳
陈皓勇
MO Weike;YAN Huanbin;ZHAO Tianyang;CHEN Haoyong(Energy and Power Research Center/School of International Energy,Jinan University,Zhuhai 519070,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Electric Power,South China University of Technology,Guangzhou 510640,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2024年第9期79-87,共9页
Power System Protection and Control
基金
国家重点研发计划项目“支撑20%新能源电量占比场景下的电网智能调度关键技术”(2022YFB2403503)资助。
关键词
频率最低值
调频备用
一次调频响应
ASF模型开环解耦
frequency nadir
frequency regulation reserve
primary frequency response
open-loop decoupling of ASF model
作者简介
莫维科(1992-),男,博士,研究方向为电力系统稳定分析,E-mail:eewkmo@gmail.com;严焕斌(2002-),男,硕士研究生,研究方向为电力系统稳定分析,E-mail:786735605@qq.com;通信作者:陈皓勇(1975-),男,博士,教授,研究方向为电力经济与电力市场、电力系统规划运行与控制。E-mail:eehychen@scut.edu.cn。
